Different budgets yield different results...
Friday night - shared a night with another band at a town festival (contract gig with sound provided), played two one-hour sets and received what we would normally get for a full night.
Saturday morning - played two one-hour sets at an all day bike event (no contract with sound provided) and received what we would normally get for one set (I'm basing that on our typical full night's pay with us providing sound).
The "profit" we made from the Friday night gig was balanced out by the "loss" on the Saturday morning gig. The same person contacted us for both shows. The sound company was the same and the band that we shared Friday night with also played on Saturday. But the budgets and M.O.'s were radically different.
Saturday night - we played a familiar venue, provided our own sound, and received what we usually get for a full night (as you would expect). Although the other gigs were fun, I prefer bar gigs much, much more.